indicatr - Table of Acid/Base Indicators The approximate pH...

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INDICATR.WPD 5/4/99 Table of Acid/Base Indicators The approximate pH of a solution can be determined by using indicators. If nothing is known about the pH of the solution, first add a couple of drops of Bromthymol Blue to a small portion of the solution. This will divide the pH range in half. A neutral solution with Bromthymol Blue will be green. If the solution is slightly acidic, yellow will be mixed in with the green. If the pH of the solution is 6, the solution color will be completely yellow. If the pH of the solution is less than 6 (more acidic), the color will also be yellow because pH's less than 6 are outside the "range of an indicator". On the other hand, if the solution is basic, the color will be bluish with Bromthymol Blue. At pH 8, the solution will be completely blue. At pH's greater than 8 the solution will also be completely blue because pH's greater than 8 are outside the range of the indicator. After observing the color of the solution with Bromthymol Blue, you can make a decision whether or not you
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This note was uploaded on 12/07/2011 for the course CHM 2045 taught by Professor Weinstein during the Fall '11 term at Santa Fe College.

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